diff --git a/README.md b/README.md
index c77692d..be1061a 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ This repo contains a bare-bones example of how to create a library using Rollup,
 We're creating a library called `how-long-till-lunch`, which usefully tells us how long we have to wait until lunch, using the [ms](https://github.com/zeit/ms) package:
 
 ```js
-console.log('it will be lunchtime in ' + howLongTillLunch());
+console.log("it will be lunchtime in " + howLongUntilLunch());
 ```
 
 ## Getting started
@@ -22,12 +22,12 @@ npm install
 
 `npm run build` builds the library to `dist`, generating three files:
 
-* `dist/how-long-till-lunch.cjs.js`
-    A CommonJS bundle, suitable for use in Node.js, that `require`s the external dependency. This corresponds to the `"main"` field in package.json
-* `dist/how-long-till-lunch.esm.js`
-    an ES module bundle, suitable for use in other people's libraries and applications, that `import`s the external dependency. This corresponds to the `"module"` field in package.json
-* `dist/how-long-till-lunch.umd.js`
-    a UMD build, suitable for use in any environment (including the browser, as a `<script>` tag), that includes the external dependency. This corresponds to the `"browser"` field in package.json
+- `dist/how-long-till-lunch.cjs.js`
+  A CommonJS bundle, suitable for use in Node.js, that `require`s the external dependency. This corresponds to the `"main"` field in package.json
+- `dist/how-long-till-lunch.esm.js`
+  an ES module bundle, suitable for use in other people's libraries and applications, that `import`s the external dependency. This corresponds to the `"module"` field in package.json
+- `dist/how-long-till-lunch.umd.js`
+  a UMD build, suitable for use in any environment (including the browser, as a `<script>` tag), that includes the external dependency. This corresponds to the `"browser"` field in package.json
 
 `npm run dev` builds the library, then keeps rebuilding it whenever the source files change using [rollup-watch](https://github.com/rollup/rollup-watch).
 
@@ -35,11 +35,9 @@ npm install
 
 ## Variations
 
-* [babel](https://github.com/rollup/rollup-starter-lib/tree/babel) — illustrates writing the source code in ES2015 and transpiling it for older environments with [Babel](https://babeljs.io/)
-* [buble](https://github.com/rollup/rollup-starter-lib/tree/buble) — similar, but using [Bublé](https://buble.surge.sh/) which is a faster alternative with less configuration
-* [TypeScript](https://github.com/rollup/rollup-starter-lib/tree/typescript) — uses [TypeScript](https://www.typescriptlang.org/) for type-safe code and transpiling
-
-
+- [babel](https://github.com/rollup/rollup-starter-lib/tree/babel) — illustrates writing the source code in ES2015 and transpiling it for older environments with [Babel](https://babeljs.io/)
+- [buble](https://github.com/rollup/rollup-starter-lib/tree/buble) — similar, but using [Bublé](https://buble.surge.sh/) which is a faster alternative with less configuration
+- [TypeScript](https://github.com/rollup/rollup-starter-lib/tree/typescript) — uses [TypeScript](https://www.typescriptlang.org/) for type-safe code and transpiling
 
 ## License
 
diff --git a/package-lock.json b/package-lock.json
index 10eccb3..9424c8c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,153 +1,550 @@
 {
   "name": "rollup-starter-lib",
-  "version": "1.0.0",
-  "lockfileVersion": 1,
+  "version": "1.1.0",
+  "lockfileVersion": 3,
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-      "dev": true,
-      "requires": {
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-        "estree-walker": "^0.6.1",
-        "is-reference": "^1.1.2",
-        "magic-string": "^0.25.2",
-        "resolve": "^1.11.0"
-      }
-    },
-    "@rollup/plugin-node-resolve": {
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-      "resolved": "https://registry.npmjs.org/@rollup/plugin-node-resolve/-/plugin-node-resolve-7.0.0.tgz",
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-      "dev": true,
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-        "@types/resolve": "0.0.8",
-        "builtin-modules": "^3.1.0",
-        "is-module": "^1.0.0",
-        "resolve": "^1.11.1"
+  "packages": {
+    "": {
+      "name": "rollup-starter-lib",
+      "version": "1.1.0",
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+        "ms": "^2.1.3"
       },
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+        "rollup": "^4.4.1"
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+      }
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+      "dev": true,
+      "dependencies": {
+        "once": "^1.3.0",
+        "wrappy": "1"
+      }
+    },
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+      "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
+      "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==",
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+      "resolved": "https://registry.npmjs.org/is-builtin-module/-/is-builtin-module-3.2.1.tgz",
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       "dev": true,
-      "requires": {
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+      },
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+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
       }
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-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-1.29.0.tgz",
-      "integrity": "sha512-V63Iz0dSdI5qPPN5HmCN6OBRzBFhMqNWcvwgq863JtSCTU6Vdvqq6S2fYle/dSCyoPrBkIP3EIr1RVs3HTRqqg==",
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-        "@types/node": "*",
-        "acorn": "^7.1.0"
+      "dependencies": {
+        "hasown": "^2.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
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+      },
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+      },
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+      }
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+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
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+        "npm": ">=8.0.0"
+      },
+      "optionalDependencies": {
+        "@rollup/rollup-android-arm-eabi": "4.4.1",
+        "@rollup/rollup-android-arm64": "4.4.1",
+        "@rollup/rollup-darwin-arm64": "4.4.1",
+        "@rollup/rollup-darwin-x64": "4.4.1",
+        "@rollup/rollup-linux-arm-gnueabihf": "4.4.1",
+        "@rollup/rollup-linux-arm64-gnu": "4.4.1",
+        "@rollup/rollup-linux-arm64-musl": "4.4.1",
+        "@rollup/rollup-linux-x64-gnu": "4.4.1",
+        "@rollup/rollup-linux-x64-musl": "4.4.1",
+        "@rollup/rollup-win32-arm64-msvc": "4.4.1",
+        "@rollup/rollup-win32-ia32-msvc": "4.4.1",
+        "@rollup/rollup-win32-x64-msvc": "4.4.1",
+        "fsevents": "~2.3.2"
+      }
+    },
+    "node_modules/supports-preserve-symlinks-flag": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/supports-preserve-symlinks-flag/-/supports-preserve-symlinks-flag-1.0.0.tgz",
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+      "dev": true,
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
       }
     },
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+    "node_modules/wrappy": {
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+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
       "dev": true
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   }
diff --git a/package.json b/package.json
index d3f58f5..b2059a6 100644
--- a/package.json
+++ b/package.json
@@ -1,20 +1,20 @@
 {
   "name": "rollup-starter-lib",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "main": "dist/how-long-till-lunch.cjs.js",
   "module": "dist/how-long-till-lunch.esm.js",
   "browser": "dist/how-long-till-lunch.umd.js",
   "dependencies": {
-    "ms": "^2.0.0"
+    "ms": "^2.1.3"
   },
   "devDependencies": {
-    "@rollup/plugin-commonjs": "^11.0.1",
-    "@rollup/plugin-node-resolve": "^7.0.0",
-    "rollup": "^1.29.0"
+    "@rollup/plugin-commonjs": "^25.0.0",
+    "@rollup/plugin-node-resolve": "^15.2.3",
+    "rollup": "^4.4.1"
   },
   "scripts": {
-    "build": "rollup -c",
-    "dev": "rollup -c -w",
+    "build": "rollup -c --bundleConfigAsCjs",
+    "dev": "rollup -c -w --bundleConfigAsCjs",
     "test": "node test/test.js",
     "pretest": "npm run build"
   },
diff --git a/rollup.config.js b/rollup.config.js
index b8c241f..d7c0d26 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -1,34 +1,34 @@
-import resolve from '@rollup/plugin-node-resolve';
-import commonjs from '@rollup/plugin-commonjs';
-import pkg from './package.json';
+import { nodeResolve } from "@rollup/plugin-node-resolve";
+import commonjs from "@rollup/plugin-commonjs";
+import pkg from "./package.json";
 
 export default [
-	// browser-friendly UMD build
-	{
-		input: 'src/main.js',
-		output: {
-			name: 'howLongUntilLunch',
-			file: pkg.browser,
-			format: 'umd'
-		},
-		plugins: [
-			resolve(), // so Rollup can find `ms`
-			commonjs() // so Rollup can convert `ms` to an ES module
-		]
-	},
+  // browser-friendly UMD build
+  {
+    input: "src/main.js",
+    output: {
+      name: "howLongUntilLunch",
+      file: pkg.browser,
+      format: "umd",
+    },
+    plugins: [
+      nodeResolve(), // so Rollup can find `ms`
+      commonjs(), // so Rollup can convert `ms` to an ES module
+    ],
+  },
 
-	// CommonJS (for Node) and ES module (for bundlers) build.
-	// (We could have three entries in the configuration array
-	// instead of two, but it's quicker to generate multiple
-	// builds from a single configuration where possible, using
-	// an array for the `output` option, where we can specify
-	// `file` and `format` for each target)
-	{
-		input: 'src/main.js',
-		external: ['ms'],
-		output: [
-			{ file: pkg.main, format: 'cjs' },
-			{ file: pkg.module, format: 'es' }
-		]
-	}
+  // CommonJS (for Node) and ES module (for bundlers) build.
+  // (We could have three entries in the configuration array
+  // instead of two, but it's quicker to generate multiple
+  // builds from a single configuration where possible, using
+  // an array for the `output` option, where we can specify
+  // `file` and `format` for each target)
+  {
+    input: "src/main.js",
+    external: ["ms"],
+    output: [
+      { file: pkg.main, format: "cjs" },
+      { file: pkg.module, format: "es" },
+    ],
+  },
 ];